Bath bombs are round, hard balls made up of components like citric acid, Epsom salts, baking soda, corn starch and essential oils. When placed in a bathtub full of water, they fizz, bubble and tickle the skin, releasing the scent of whichever essential oil they were infused with.
Bath bombs' outsides are often spritzed with witch hazel in order to help create a hard, crusty shell; however, some people prefer not to use witch hazel due to allergies or because they simply don't have any on hand. Nevertheless, it's possible to create the crusty exterior through other means.
Put on the dust mask. Put on the gloves, if desired.
Mix 1/4 cup olive oil, 1 1/2 tbsp. water, 1/2 tsp. borax, 2 tsp. essential oil and a few drops of food coloring (optional) in a mixing bowl.
Process the Epsom salts in a spice or coffee grinder until the salts are very fine and similar in consistency to the baking soda and cornstarch.
Strain or sift 2/3 cup Epsom salts, 2 cups baking soda, 1 cup cornstarch and 1 cup citric acid into a mixing bowl to ensure it is of even consistency and is as smooth as possible.
Make a well in the middle of the dry ingredients. Slowly pour the wet ingredient mixture into the well with one hand while completely combining the dry and wet ingredients together with the other hand.
Preheat the oven to 200 degrees Fahrenheit.
Cover the baking sheet with wax or parchment paper.
Scoop out a scoopful of the mixture with the ice cream scoop and release the mixture into your hands. Pack the mixture together with your hands as if you were making a snowball. If you are using soap molds or Christmas ornaments, densely pack some of the mixture into each side of the mold or ornament and then snap the mold or ornament together.
Place the bath bomb balls you've formed with your hands onto the baking sheet. If you have used a mold or Christmas ornament, unsnap the mold or ornament and remove one half of the mold or ornament. Place a hand over the exposed half of the bath bomb. Rotate your hands and the bath bomb 180 degrees so that the bath bomb will gently drop from the other half of the mold or Christmas ornament and into your hand. Be as careful and as gentle as possible during this step because the bath bombs are very fragile. If the bath bomb crumbles, repack and try again. Repeat this step until all the mixture has been formed into bath bombs and placed on the baking sheet.
Place the bath bombs in your preheated oven for three to four hours.
Remove the bath bombs and package as desired.